This sounds like exactly what the grandfather post (by wasdfff) was discussing. A competitor advertised their product based on the keywords you searched for.
You didn't buy their product, but Google helped them get your gaze briefly.
What is search but a list of adverts associated with your keywords?
Google can do without this "google tax", and imho they should. It's unethical , and it's not like a competitor putting a sign next to yours. The user is literally searching for a brand and is instead driven to click another. At best the competitor should be an ad on the side in this case. Considering how (especially in mobiles) google is often used as a kind of DNS-autocorrect in the omnibox, this behavior is unethical on the same level as websites with popups. A rich company like google would not normally allow it to itself, they can easily dispense with such sleaziness. The fact that they can do it unpunished is indicative of a monopoly position.
You didn't buy their product, but Google helped them get your gaze briefly.
What is search but a list of adverts associated with your keywords?